[RFC PATCH v1 0/4] Add migration support for VFIO device

[Kirti Wankhede <kwankhede@nvidia.com>]

Add migration support for VFIO device

This Patch set include patches as below:
- Define KABI for VFIO device for migration support.
- Generic migration functionality for VFIO device.
  * This patch set adds functionality only for PCI devices, but can be
    extended to other VFIO devices.
  * Added all the basic functions required for pre-copy, stop-and-copy and
    resume phases of migration.
  * Added state change notifier and from that notifier function, VFIO
    device's state changed is conveyed to VFIO vendor driver.
  * During save setup phase and resume/load setup phase, migration region
    is queried from vendor driver and is mmaped by QEMU. This region is
    used to read/write data from and to vendor driver.
  * .save_live_pending, .save_live_iterate and .is_active_iterate are
    implemented to use QEMU's functionality of iteration during pre-copy
    phase.
  * In .save_live_complete_precopy, that is in stop-and-copy phase,
    iteration to read data from vendor driver is implemented till pending
    bytes returned by vendor driver are not zero.
  * .save_cleanup and .load_cleanup are implemented to unmap migration
    region that was setup duing setup phase.
  * Added function to get dirty pages bitmap from vendor driver.
- Add vfio_listerner_log_sync to mark dirty pages.
- Make VFIO PCI device migration capable.

Thanks,
Kirti

Kirti Wankhede (4):
  VFIO KABI for migration interface
  Add migration functions for VFIO devices
  Add vfio_listerner_log_sync to mark dirty pages
  Make vfio-pci device migration capable.

 hw/vfio/Makefile.objs         |   2 +-
 hw/vfio/common.c              |  32 ++
 hw/vfio/migration.c           | 716 ++++++++++++++++++++++++++++++++++++++++++
 hw/vfio/pci.c                 |  13 +-
 include/hw/vfio/vfio-common.h |  23 ++
 linux-headers/linux/vfio.h    |  91 ++++++
 6 files changed, 869 insertions(+), 8 deletions(-)
 create mode 100644 hw/vfio/migration.c

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2.7.0